Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 40: Quantum Effects (QED) I

Q 40.1: Vortrag

Mittwoch, 13. März 2019, 14:00–14:15, S Ex 04 E-Tech

Strong-coupling of electrons and cavity-photons in an electron microscope — •Ofer Kfir and Claus Ropers — IV. Physics Institute, University of Göttingen, 37077 Göttingen, Germany

Inelastic scattering of electrons with a specimen, as investigated in electron microscopy, creates entanglement between the electron and the sample excitation, e,g., an electromagnetic mode [1]. Typically, fast dephasing makes this effect challenging to detect. For example, plasmonic modes, readily observable by electron light-scattering due to their high polarizability, suffer from substantial losses, and therefore, exhibit typical lifetimes of few femtoseconds. This prevents successive electrons in the electron microscope beam to interact with the same excitation.

Here, we propose transparent dielectric cavities as possible mediators for few-electron entanglement. Spontaneous and stimulated scattering processes are studied in a second-quantization model for the coupled electron and photon systems. The combination of high quality factors and long interaction lengths represents an attractive combination of sufficient coupling strength and long lifetime. Furthermore, electron-photon phase-matching may offer the possibility to reach conditions of strong coupling and high frequency selectivity.

[1] Schattschneider and Löffler, Ultramicroscopy 190, 39 (2018)